CN101901069B - Multipoint touch screen and driving method thereof - Google Patents
Multipoint touch screen and driving method thereof Download PDFInfo
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- CN101901069B CN101901069B CN2009103026322A CN200910302632A CN101901069B CN 101901069 B CN101901069 B CN 101901069B CN 2009103026322 A CN2009103026322 A CN 2009103026322A CN 200910302632 A CN200910302632 A CN 200910302632A CN 101901069 B CN101901069 B CN 101901069B
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Abstract
The invention provides a multipoint touch screen which comprises a first baseplate, a second baseplate, a first transparent conducting layer and a second transparent conducting layer, wherein the first baseplate and the second baseplate are oppositely arranged, the first transparent conducting layer is arranged on the inner surface of the first baseplate, and the second transparent conducting layer is arranged on the inner surface of the second baseplate. The resistivity of the second transparent conducting layer along a first direction is larger than the resistivity thereof along a second direction. The second transparent conducting layer is a carbon nanotube film, furthermore, carbon nanotubes in the carbon nanotube film are preferentially oriented and arranged along a single direction, and the single direction is parallel to the second direction of the second transparent conducting layer. The invention also provides a driving method of the multipoint touch screen.
Description
Technical field
The present invention relates to the driving method of a kind of multi-point touch panel and a kind of this multi-point touch panel.
Background technology
In recent years, be accompanied by the high-performance words and the diversified development of various electronic equipments such as mobile phone and touch navigation system, the electronic equipment that touch-screen is installed progressively increases.Such electronic equipment makes the user directly to contact this touch-screen so that to this electronic equipment input information with hand or other object; (for example can reduce or eliminate the user like this to other input equipments; Keyboard, mouse, telepilot etc.) dependence, user friendly operation.
The touch-screen of prior art mainly comprises resistance-type, condenser type, infrared-type and surface acoustic wave type.General touch-screen in use once can only carry out the input of a touch action, develops recently to carry out simultaneously or the multi-point touch panel of multiple spot input more at 2, becomes fashion trend gradually.Multi-point touch panel mainly is the condenser type multi-point touch panel; Comprise two transparency conducting layers that are separately positioned on a clear glass two sides as the one of which; Two conductive layers comprise the many leads that laterally arrange respectively; And the lead on two sides is parallel to each other, through these many leads of scanning repeatedly, analyzes the coordinate that changes in capacitance on it is judged the touch point.
Yet; The sweep frequency of condenser type multi-point touch panel is with its resolution, and promptly with the quantity of lead, being how much quantity increases; Therefore; High-resolution touch-screen driving method more complicated, and very high to the requirement of chip for driving and controller has increased the complicacy and the cost of multi-point touch panel virtually.Simultaneously, general condenser type multi-point touch panel once can only be discerned two touch points, surpasses when operate two touch points and mistake will occur, and therefore, the application of prior art multi-point touch panel has certain limitation.
Summary of the invention
In order to solve prior art multi-point touch panel structure and to drive complicacy, the few problem of touch point quantity of carrying out simultaneously is necessary to provide a kind of structure and driving simple, and the multi-point touch panel that can carry out the operation of a plurality of touch points simultaneously.
Also be necessary to provide a kind of driving method of this multi-point touch panel.
A kind of multi-point touch panel, it comprises and is oppositely arranged one first substrate and one second substrate, one be arranged on this first substrate inside surface first transparency conducting layer and be arranged on second transparency conducting layer of this second substrate inside surface.This second transparency conducting layer along the resistivity of first direction greater than it along second direction resistivity.This second transparency conducting layer is a carbon nano-tube film, and further, the CNT in this carbon nano-tube film is arranged of preferred orient along single direction, and this single direction is parallel to the second direction of this second transparent conductive film.
A kind of multi-point touch panel, it comprises a carbon nano-tube film and a transparent conductive film that is oppositely arranged, the transverse resistivity of this carbon nano-tube film is greater than its longitudinal resistivity.
A kind of multi-point touch panel driving method, this multi-point touch panel comprise one first transparent conductive film and one second transparent conductive film, this second transparent conductive film along first direction resistivity greater than it along second direction resistivity.When this touch-screen was accepted a touch action, pairing first transparent conductive film in this touch point was electrically connected second transparent conductive film.This localization method comprises: provide a reference voltage to this first transparent conductive film; Provide a stable DC voltage to this second transparent conductive film to be parallel to its horizontal side; Measure the voltage that this second transparent conductive film is parallel to the each point of its horizontal opposite side; Judge the coordinate of touch point according to the variation of the second transparent conductive film measurement point voltage.
A kind of driving method of multi-point touch panel; This multi-point touch panel comprises a carbon nano-tube film; The transverse resistivity of this carbon nano-tube film is greater than its longitudinal resistivity; This driving method comprises: be parallel to its horizontal first side and inner a voltage be provided between a bit arbitrarily at this carbon nano-tube film, measure this carbon nano-tube film voltage of the second side of this first side relatively, confirm this some position on this multi-point touch panel arbitrarily according to the variation of this second side voltage.
Compared to prior art; This multi-point touch panel adopts the anisotropic carbon nano-tube material of resistivity to make transparency conducting layer; Especially adopt and have the carbon nano-tube film making transparency conducting layer that is arranged of preferred orient; It has following advantage: one of which, and the resistivity with the carbon nano-tube film that is arranged of preferred orient has anisotropy, through measuring the voltage of this carbon nano-tube film side; According to the actual coordinate that the position and the fall of voltage decline just can be judged the touch point, this multi-point touch panel has simple structure and simple driving method; They are two years old; This carbon nano-tube film that is arranged of preferred orient is divided into a plurality of conductive channels along the CNT bearing of trend; The conductive channel that different exploring electrodes is corresponding different, its voltage are independent mutually, so this multi-point touch panel can be realized the multi-point touch operation; And the touch point is unrestricted in theory, really realizes function of multi-spot touch; Its three, the excellent mechanical properties of CNT makes carbon nanotube layer have very high toughness and physical strength, so, adopt the durability that carbon nanotube layer producing transparent conductive layer can corresponding this multi-point touch panel of raising; Its five, carbon nano-tube film has good electrical conductivity, can improve the electric conductivity of this multi-point touch panel, thereby improves its resolution and degree of accuracy; Its four, carbon nano-tube film has good light peneration, thus this multi-point touch panel has good optical performance.
Description of drawings
Fig. 1 is the cross-sectional view of multi-point touch panel first embodiment of the present invention.
Fig. 2 is first conducting stratum of multi-point touch panel shown in Figure 1 and the planar structure synoptic diagram of second conducting stratum.
Fig. 3 is the voltage curve of the exploring electrode of multi-point touch panel shown in Figure 1.
Fig. 4 is the touch point physical location synoptic diagram that this multi-point touch panel is carried out three point operations.
Fig. 5 is the voltage curve of the exploring electrode of multi-point touch panel shown in Figure 4 under 3 touch operation.
Fig. 6 is first conducting stratum and the second conducting stratum planar structure synoptic diagram of second embodiment of multi-point touch panel of the present invention.
Fig. 7 is first conducting stratum and the second conducting stratum planar structure synoptic diagram of the 3rd embodiment of multi-point touch panel of the present invention.
Fig. 8 is first conducting stratum and the second conducting stratum planar structure synoptic diagram of the 4th embodiment of multi-point touch panel of the present invention.
Embodiment
See also Fig. 1, it is the cross-sectional view of multi-point touch panel first embodiment of the present invention.This multi-point touch panel 20 comprises one first substrate 21 and one second substrate 22 that is oppositely arranged.This first substrate 21 is generally processed by elastic apparent material, and this second substrate 22 is processed to carry certain pressure by the rigid transparent material.In the present embodiment, this first substrate 21 is a polyester film, and this second substrate 22 is a glass substrate.The surface of these first substrate, 21 relative these second substrate, 22 1 sides is provided with one first conducting stratum 23.The surface of these second substrate, 22 relative these first substrate, 21 1 sides is provided with one second conducting stratum 24.One bonding coat 25 is provided with the edge between this first substrate 21 and this second substrate 22, thereby this first substrate 21 is bonded together with this second substrate 22.Distance between this first conducting stratum 23 and this second conducting stratum 24 is 210 microns.Be arranged at intervals with a plurality of gap 27 that are isolated from each other between this first conducting stratum 23 and this second conducting stratum 24, this son 27 tools insulation of a plurality of gaps and supporting role are so that this first conducting stratum 23 is electric insulating state under original state with this second conducting stratum 24.Be appreciated that when these multi-point touch panel 20 sizes hour, this gap 27 be optional structure, only need guarantee that first conducting stratum 23 and this second conducting stratum 24 get final product for electric insulating state under original state.
Please consult Fig. 2 in the lump, it is the planar structure synoptic diagram of this first conducting stratum 23 and this second conducting stratum 24.In this figure, introduce cartesian coordinate system, it comprises orthogonal X-direction and Y direction.This first conducting stratum 23 comprises one first transparency conducting layer 231 and one first electrode 232.This first transparency conducting layer 231 is indium tin oxide films of a rectangle, thereby has lower resistivity and higher light transmittance.This first electrode 232 is arranged on the four side of this first transparency conducting layer 231 continuously, and is electrically connected with this first transparency conducting layer 231.
This second conducting stratum 24 comprises one second transparency conducting layer 241, one second electrode 242 and a plurality of exploring electrode 243.
This second transparency conducting layer 241 is processed by the uniform carbon nano-tube film material of thickness.The thickness of this carbon nano-tube film is 0.5 nanometer to 100 micron.This carbon nano-tube film is the layer structure with uniform thickness that orderly CNT forms.This CNT is SWCN, double-walled carbon nano-tube or multi-walled carbon nano-tubes; Wherein, The diameter of SWCN be 0.5 nanometer to 50 nanometers, the diameter of double-walled carbon nano-tube be 1.0 nanometers to 50 nanometers, the diameter of multi-walled carbon nano-tubes is that 1.5 nanometers are to 50 nanometers.CNT in this carbon nano-tube film is arranged of preferred orient or is arranged of preferred orient along different directions along single direction.
In the present embodiment, this second transparency conducting layer 241 adopts the multilayer carbon nanotube films of carbon nano-tube film or overlapping setting, and the overlapping angle of multilayer carbon nanotube films is not limit.This CNT is to arrange in order, says that further this carbon nano-tube film comprises the CNT of a plurality of preferred orientations, and this CNT has basic equal lengths and is connected to each other through Van der Waals force, thereby forms continuous carbon nano-tube bundle.Particularly, the CNT in this second transparency conducting layer 241 is arranged of preferred orient along Y direction shown in Figure 2.
Above-mentioned have the carbon nano-tube film that is arranged of preferred orient and have the anisotropic characteristics of impedance, that is, this carbon nano-tube film is far smaller than its resistivity perpendicular to the CNT bearing of trend along the resistivity of CNT bearing of trend.Specifically, as shown in Figure 2, this second transparency conducting layer 241 is far smaller than the transverse resistivity of its X-direction along the longitudinal resistivity of Y direction.The longitudinal resistivity of the CNT that present embodiment adopted is greater than 10 times transverse resistivity.
This second electrode 242 is a long strip type electrode, and it is arranged on the side of this second transparency conducting layer 241 perpendicular to the CNT bearing of trend, that is, and and the upper side edge of this second transparency conducting layer 241 among Fig. 2, and be electrically connected this second transparency conducting layer 241.
These a plurality of exploring electrodes 243 evenly are arranged on another side of these second transparency conducting layer, 241 relative these second electrodes 242, that is, and and the lower side of this second transparency conducting layer 241 among Fig. 2.And each exploring electrode 243 all is electrically connected this second transparency conducting layer 241.Because the resistance anisotropy of carbon nano-tube film, these a plurality of exploring electrodes 243 are divided into the conductive channel of a plurality of correspondences with this second transparency conducting layer 241, and the electrical property of each conductive channel is separate.
This first electrode 232, second electrode 242 and this exploring electrode 243 are processed by low-resistance material, like aluminium, copper or silver etc., to reduce the decay of electric signal.In the present embodiment, it is processed by conductive silver paste.
The driving method of this multi-point touch panel 2 is following:
This first electrode 232 is electrically connected the ground of these multi-point touch panel 2 systems, and promptly the voltage of this first transparency conducting layer 231 is 0 volt.This second electrode 242 is accepted a stable DC voltage, and as 10 volts, then the voltage of this second transparency conducting layer 241 is 10 volts.These a plurality of exploring electrodes 243 are used for surveying the change in voltage of these second transparency conducting layer, 241 correspondence positions, give information for touching the location.
When the user does not carry out any operation to this multi-point touch panel 2, this first electrically conducting transparent layer by layer 231 with these second transparency conducting layer, 241 mutually insulateds, to the not influence of voltage of this second transparency conducting layer 241.Then the voltage of these a plurality of exploring electrodes 243 equates, is 10 volts.As shown in Figure 3, its be this when not carrying out touch operation, the voltage curve of a plurality of exploring electrodes 243.Transverse axis is represented the physics horizontal ordinate of these a plurality of exploring electrodes 243 among Fig. 3, and the longitudinal axis is represented the voltage of these a plurality of exploring electrodes 243.Because the voltage of these a plurality of exploring electrodes 243 equates, is expressed as a straight line perpendicular to ordinate among the figure.
When the user carried out touch operation to this multi-point touch panel 2, this first substrate 21 bent towards this second substrate 22 under pressure, was electrically connected thereby this first transparency conducting layer 231 is produced in this touch point with this second transparency conducting layer 241.If single-point touches then produces single electric connection point in the touch place; If multiple point touching, a plurality of electric connection points of then corresponding generation.Because the voltage of this first conductive layer 231 is to the influence of the voltage of this second conductive layer 241, at this moment, the voltage of the pairing exploring electrode 243 in touch point changes.Particularly, the voltage of this corresponding point exploring electrode 243 will be lower than the voltage of this second electrode 231, promptly less than 10 volts.Because the different different conductive channels of exploring electrode 243 correspondences, its voltage is independent mutually, can not produce the phase mutual interference, and the change in voltage of then a plurality of exploring electrodes 243 also is separate.Experiment shows that the amplitude that these exploring electrode 43 voltages reduce is relevant with the ordinate of this present position, touch point.This touch point is more near this second electrode 242, and is littler to the voltage drop amplitude of exploring electrode 243 that should the touch point; Otherwise this touch point is more away from this second electrode 242, and is bigger to the voltage drop amplitude of exploring electrode 243 that should the touch point, just the voltage of the exploring electrode 243 of touch point and this touch point to this second electrode 242 apart from becoming positively related relation.
Be illustrated in figure 4 as the touch point physical location of simultaneously this multi-point touch panel 2 being carried out three point operations, wherein, A, B, C represent this physical location of three touch points on this multi-point touch panel 2.Fig. 5 is the voltage curve of these a plurality of exploring electrodes 243, and wherein, transverse axis is represented the horizontal ordinate of these a plurality of exploring electrodes 243, and the longitudinal axis is represented the voltage of exploring electrode 243.
According to the position of voltage drop point in coordinate axis in the voltage curve, can directly judge this a plurality of touch points horizontal ordinate.According to the voltage fall of the corresponding exploring electrode 243 in touch point, can analyze these a plurality of touch points distance of this second electrode, the i.e. ordinate of this touch point in coordinate relatively.Can confirm the coordinate of all touch points on this multi-point touch panel through said method.
The multi-point touch panel 2 of above-mentioned employing carbon nano-tube film has the following advantages: one of which; Resistivity with the carbon nano-tube film that is arranged of preferred orient has anisotropy; Through measuring the voltage of this exploring electrode 243; According to the actual coordinate that the position and the fall of voltage decline just can be judged the touch point, this multi-point touch panel 2 has simple structure and simple driving method; They are two years old; This carbon nano-tube film that is arranged of preferred orient is divided into a plurality of conductive channels along the CNT bearing of trend; The different different conductive channels of exploring electrode 243 correspondences, its voltage is independent mutually, so this multi-point touch panel 2 can be realized the multi-point touch operation; And the touch point is unrestricted in theory, really realizes function of multi-spot touch; Its three, the excellent mechanical properties of CNT makes carbon nanotube layer have very high toughness and physical strength, so, adopt the durability that carbon nanotube layer producing transparent conductive layer can this multi-point touch panel 2 of corresponding raising; Its four, carbon nano-tube film has good electrical conductivity, electric conductivity that can this multi-point touch panel, thereby improve its resolution and degree of accuracy; Its five, carbon nano-tube film has good light transmittance, thus this multi-point touch panel has good light transmittance.
See also Fig. 6, it is second embodiment of multi-point touch panel of the present invention, has only represented first conducting stratum 33 and second conducting stratum, 34 planar structures among the figure.This multi-point touch panel 3 is similar with the multi-point touch panel 2 of first embodiment, and its difference is: this second conducting stratum lower side is provided with a plurality of first exploring electrodes 343, and its relative upper side edge is provided with a plurality of second identical exploring electrodes 344.This first exploring electrode 343 and this second exploring electrode 344 distribute respectively symmetrically and evenly, and are electrically connected this second transparency conducting layer 341.
The driving method of this multi-point touch panel is similar with the driving method of the multi-point touch panel 2 of first embodiment, and difference is: this first exploring electrode 343 and second exploring electrode 344 are promptly as the voltage input electrode, also as the detecting voltage output electrode.When this first exploring electrode 343 was accepted stable DC voltage as the voltage input electrode, this second exploring electrode 344 was as the detecting voltage output electrode; When this second exploring electrode 344 was accepted stable DC voltage as the voltage input electrode, this first exploring electrode 343 was as the voltage input electrode.This first exploring electrode 343 and second exploring electrode 344 adopt the mode of I/O in turn to drive like this, can increase the bearing accuracy of this multi-point touch panel 30.
See also Fig. 7, it is the 3rd embodiment of multi-point touch panel of the present invention, only representes the planar structure of one first conducting stratum 43 and one second conducting stratum 44 among the figure.This multi-point touch panel 4 is similar with the multi-point touch panel 2 of first embodiment; Its difference is: the structural similarity of the structure of this first conducting stratum 43 and this second conducting stratum 44; Second transparency conducting layer 441 that i.e. this first conducting stratum 43 first transparency conducting layer 431 of comprising that a carbon nano-tube film processes, first electrode 432 and a plurality of first exploring electrode 433 of a stripe shape, this second conducting stratum 44 comprise that a carbon nano-tube film processes, second electrode 442 and a plurality of second exploring electrode 443 of a stripe shape.Further; CNT in this first transparent conductive film 431 extends along X-direction in the coordinate axis; The left side that this first electrode 432 is arranged on this first transparency conducting layer 431 is extended along Y direction; And being electrically connected this first transparent conductive film 431, these a plurality of exploring electrodes 433 evenly are arranged on the right edge of these first transparent conductive film, 431 relative these first electrodes 432, and are electrically connected this first transparent conductive film 431.
The driving method of this multi-point touch panel 40 is: when confirming the touch point horizontal ordinate; This first electrode 432 and/or the first exploring electrode ground connection 433; This second electrode 442 connects high voltage, and as 10 volts, the voltage of measuring these a plurality of second exploring electrodes 443 is confirmed the horizontal ordinate of touch point; When confirming the touch point ordinate, this second electrode 442 and/or second exploring electrode, 443 ground connection, this first electrode 432 connects high voltage, and as 10 volts, the voltage of measuring these a plurality of first exploring electrodes 433 is confirmed the ordinate of touch point.
In the driving method of this touch-screen 40; Through applying high voltage in turn in this first electrode 431 and this second electrode 441; The change in voltage of directly measuring this first exploring electrode 433 and second electrode 443 can be confirmed the ordinate and the horizontal ordinate of touch point, and does not need the fall of analytical voltage.This driving method is simple more, accurate.
See also Fig. 8, it is the 4th embodiment of multi-point touch panel of the present invention, has only represented the planar structure of first conducting stratum 53 and second conducting stratum 54 among the figure.This multi-point touch panel 5 is similar with the multi-point touch panel 4 of the 3rd embodiment, and its difference is: the structural similarity of the structure of this first conducting stratum 53 and this second conducting stratum 54.Particularly, these first conducting stratum, 531 left side are provided with a plurality of first exploring electrodes 532, and its relative right edge is provided with a plurality of second identical exploring electrodes 533.The even distribution of symmetry respectively of this first exploring electrode 532 and this second exploring electrode 533, and be electrically connected this first transparency conducting layer 531.CNT in the carbon nano-tube film of this first conducting stratum 531 extends along X direction in the coordinate axis.54 sides are provided with a plurality of the 3rd exploring electrodes 542 on this second conducting stratum, and its relative lower side is provided with a plurality of the 4th identical exploring electrodes 543.The 3rd exploring electrode 542 and the 4th exploring electrode 543 distribute respectively symmetrically and evenly, and are electrically connected this second transparency conducting layer 541.CNT in the carbon nano-tube film of this second conducting stratum 541 extends along y direction in the coordinate axis.
The driving method of this multi-point touch panel 50 combines the driving method of the second embodiment multi-point touch panel 30 and the 3rd embodiment multi-point touch panel 40; Its characteristics are: when first, second exploring electrode 532,533 of this first conducting stratum 53 simultaneously during ground connection; The the 3rd, the 4th exploring electrode 542,543 of this second conducting stratum 54 alternately connects high voltage, and confirms the horizontal ordinate of touch point through the change in voltage of measuring opposite side the 4th, the 3rd exploring electrode 543/542; When the 3rd, the 4th exploring electrode 542,543 of this second conducting stratum 54 simultaneously during ground connection; First, second exploring electrode 532,533 of this first conducting stratum 53 alternately connects high voltage, and confirms the ordinate of touch point through the change in voltage of measuring relative second, the first side exploring electrode 533,532.The driving method of this multi-point touch panel 50 has simply, characteristic of accurate.
The transparency conducting layer of this multi-point touch panel 30,40,50 all can adopt the carbon nano-tube film described in above-mentioned first embodiment.
Claims (27)
1. multi-point touch panel; It comprises and is oppositely arranged one first substrate and one second substrate; One be arranged on this first substrate inside surface first transparency conducting layer and be arranged on second transparency conducting layer of this second substrate inside surface; This second transparency conducting layer is a carbon nano-tube film, it is characterized in that: the resistivity of edge one first direction of this second transparency conducting layer is greater than its resistivity along a second direction, and this first direction is perpendicular to this second direction; This first substrate inside surface further is provided with first electrode of this first transparency conducting layer of electrical connection; This second substrate inside surface further is provided with one second electrode and a plurality of first exploring electrode, and this second electrode is arranged on the side that this carbon nano-tube film is parallel to this first direction, and is electrically connected this carbon nano-tube film; These a plurality of first exploring electrodes are arranged on this carbon nano-tube film side of this second electrode relatively, and are electrically connected this carbon nano-tube film.
2. multi-point touch panel as claimed in claim 1 is characterized in that: the CNT in this carbon nano-tube film is arranged of preferred orient along single direction, and this single direction is parallel to this second direction.
3. multi-point touch panel as claimed in claim 1 is characterized in that: this first electrode grounding, and this second electrode connects a stable DC voltage, and this first exploring electrode is used to survey the voltage of the carbon nano-tube film of its correspondence position.
4. multi-point touch panel as claimed in claim 1 is characterized in that: this second electrode comprises a plurality of second exploring electrodes, and is electrically connected this carbon nano-tube film.
5. multi-point touch panel as claimed in claim 4; It is characterized in that: this first electrode grounding; This first exploring electrode alternately connects a direct current voltage with this second exploring electrode; When first exploring electrode or this second exploring electrode do not connect stable DC voltage, be used to survey the voltage of the carbon nano-tube film of its correspondence position.
6. multi-point touch panel as claimed in claim 1 is characterized in that: this first transparency conducting layer is a carbon nano-tube film.
7. multi-point touch panel as claimed in claim 6; It is characterized in that: the CNT in the carbon nano-tube film of this first transparency conducting layer is arranged of preferred orient along one first single direction; This first single direction is parallel to this first direction; CNT in the carbon nano-tube film of this second transparency conducting layer is arranged of preferred orient along one second single direction, and this second single direction is parallel to this second direction.
8. multi-point touch panel as claimed in claim 7; It is characterized in that: this first substrate inside surface further is provided with a plurality of the 4th exploring electrodes; This first electrode is arranged in this first transparency conducting layer the side perpendicular to this first direction; And be electrically connected this first transparency conducting layer, these a plurality of the 4th exploring electrodes are arranged on this first transparency conducting layer side of this first electrode relatively, and are electrically connected this first transparency conducting layer.
9. multi-point touch panel as claimed in claim 8 is characterized in that: this first electrode comprises a plurality of the 3rd exploring electrodes, and is electrically connected this first transparency conducting layer.
10. multi-point touch panel as claimed in claim 1 is characterized in that: this second electrode comprises a plurality of second exploring electrodes, and is electrically connected this second transparency conducting layer.
11. multi-point touch panel as claimed in claim 1 is characterized in that: this carbon nano-tube film comprises one deck CNT at least.
12. multi-point touch panel as claimed in claim 1 is characterized in that: the thickness of this carbon nano-tube film is 0.5 nanometer to 100 micron.
13. multi-point touch panel as claimed in claim 1 is characterized in that: the CNT in this carbon nano-tube film has equal lengths, and is connected to each other through Van der Waals force, thereby forms continuous carbon nano-tube bundle.
14. multi-point touch panel as claimed in claim 1 is characterized in that: the CNT in this carbon nano-tube film is SWCN, double-walled carbon nano-tube or multi-walled carbon nano-tubes.
15. multi-point touch panel as claimed in claim 14 is characterized in that: the diameter of SWCN be 0.5 nanometer to 50 nanometers, the diameter of double-walled carbon nano-tube be 1.0 nanometers to 50 nanometers, the diameter of multi-walled carbon nano-tubes is that 1.5 nanometers are to 50 nanometers.
16. multi-point touch panel driving method; This multi-point touch panel comprises one first transparent conductive film and one second transparent conductive film; The resistivity of edge one first direction of this second transparent conductive film is greater than its resistivity along a second direction, and this first direction is perpendicular to this second direction, when this touch-screen is accepted a touch action; Pairing first transparent conductive film in this touch point is electrically connected second transparent conductive film, and this driving method comprises:
Provide a reference voltage to this first transparent conductive film;
Provide a voltage to be parallel to a side of its first direction to this second transparent conductive film;
Measure the voltage of each point that this second transparent conductive film is parallel to the opposite side of its first direction;
Judge the coordinate of touch point according to the variation of this second transparent conductive film measurement point voltage.
17. multi-point touch panel driving method as claimed in claim 16 is characterized in that: judge that according to the change location of this second transparent conductive film measurement point voltage the touch point is parallel to the coordinate of this transparent conductive film first direction.
18. multi-point touch panel driving method as claimed in claim 17 is characterized in that: judge that according to the amplitude of the variation of this second transparent conductive film measurement point voltage the touch point is parallel to the coordinate of this transparent conductive film second direction.
19. multi-point touch panel driving method as claimed in claim 16 is characterized in that: first transparent conductive film of this multi-point touch panel along the resistivity of this second direction greater than its resistivity along this first direction, this driving method further comprises:
Provide a reference voltage to this second transparent conductive film;
Provide a voltage to be parallel to a side of its second direction to this first transparent conductive film;
Measure the voltage of each point that this first transparent conductive film is parallel to the opposite side of its second direction;
Judge the coordinate of touch point according to the variation of the first transparent conductive film measurement point voltage.
20. multi-point touch panel driving method as claimed in claim 19 is characterized in that: judge that according to the change location of this first transparent conductive film measurement point voltage the touch point is parallel to the coordinate of this second direction.
21. multi-point touch panel driving method as claimed in claim 20 is characterized in that: judge that according to the amplitude of the variation of this first transparent conductive film measurement point voltage the touch point is parallel to the coordinate of this transparent conductive film first direction.
22. multi-point touch panel driving method as claimed in claim 16 is characterized in that: this first transparent conductive film and/or this second transparent conductive film are a carbon nano-tube film.
23. multi-point touch panel driving method as claimed in claim 16 is characterized in that: the CNT in this carbon nano-tube film is arranged of preferred orient along single direction.
24. multi-point touch panel driving method as claimed in claim 16 is characterized in that: the CNT single direction of this first transparent conductive film is parallel to first direction, and the CNT single direction of this second transparent conductive film is parallel to this second direction.
25. the driving method of a multi-point touch panel; This multi-point touch panel comprises a carbon nano-tube film at least; The transverse resistivity of this carbon nano-tube film is greater than its longitudinal resistivity; This driving method comprises: be parallel to its horizontal first side and inner a voltage be provided between a bit arbitrarily at this carbon nano-tube film; Measure the relatively voltage of a plurality of measurement points of the second side of this first side of this carbon nano-tube film, confirm this some position on this multi-point touch panel arbitrarily according to the variation of the voltage of these a plurality of measurement points in second side.
26. the driving method of multi-point touch panel as claimed in claim 25 is characterized in that: the CNT in this carbon nano-tube film is arranged of preferred orient along single direction, and this single direction is parallel to the vertical of this carbon nano-tube film.
27. the driving method of multi-point touch panel as claimed in claim 25; It is characterized in that: this multi-point touch panel further comprises the transparent conductive film that relative this carbon nano-tube film is provided with; This transparent conductive film can with being electrically connected arbitrarily a bit of this carbon nano-tube film, corresponding any between any in this voltage is applied to this CNT through this transparent conductive film and more any electrical connection of this CNT first side and its inside.
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| CN102622090B (en) * | 2011-01-28 | 2016-06-15 | 清华大学 | Flexible keyboard |
| CN102622089B (en) | 2011-01-28 | 2016-03-30 | 清华大学 | Flexible keyboard |
| TWI441067B (en) * | 2011-02-21 | 2014-06-11 | Sentelic Corp | Transparent touch pad and a method for manufacturing the same |
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| CN102956284A (en) * | 2011-08-31 | 2013-03-06 | 天津富纳源创科技有限公司 | Transparent conductive film and touch panel using same |
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